Zhang, The SPILL storage group is the second SG that you assign in your ACS routines with:
*WHEN(&HLQ = &IMSDB) SET &STORGRP = 'SGIMSDB','SGSPILL'* This the "overflow SG" as you named it earlier, used at allocation time. The "Extend SG" is used to extend an existing dataset if the current SG does not have enough free volumes. Kees. "Smartcurl Zhang" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > And I read this in redbook *Converting to DFSMShsm*(SG246524),page 124: > > "Use of SPILL storage group: > You can have a set of volumes available that will only be selected if SMS > sees > that this next new allocation will cause all enabled volumes in the selected > storage group to exceed their high threshold. Allocations can now complete > to > the SPILL storage group until you have a chance to make space available in > the primary storage group. One advantage of using SPILL storage groups is > that allocations from any storage group can go to SPILL. One disadvantage is > that only new data sets and not the extension of existing data sets are > eligible > for allocation in the SPILL storage group." > > That really confused me... > You sure a dataset can put its initial part in primay SG and secondary part > in a overflow SG? > > > > On Thu, Dec 4, 2008 at 3:48 PM, Vernooy, C.P. - SPLXM > <[EMAIL PROTECTED]>wrote: > > > Yes. > > > > From the ISMF Help: > > The EXTEND SG NAME specifies the name of a storage group > > that datasets in the Primary storage group can extend to. > > > > Datasets that started their life in SGIMSDB can extend to SGSPILL if > > needed for growth. > > > > Kees. > > > > "Smartcurl Zhang" <[EMAIL PROTECTED]> wrote in message > > news:<[EMAIL PROTECTED]>... > > > Thank you,Kees > > > > > > You mean if I specify SGSPILL in *Extend SG Name* field of SGIMSDB > > storage > > > group,some datasets might crossed these two storage group?SGSPILL and > > > SGIMSDB? > > > > > > > > > Smartcurl Zhang > > > > > > On Wed, Dec 3, 2008 at 8:21 PM, Vernooy, C.P. - SPLXM > > > <[EMAIL PROTECTED]>wrote: > > > > > > > > > > > > > > > "Smartcurl Zhang" <[EMAIL PROTECTED]> wrote in message > > > > > > news:<[EMAIL PROTECTED]>... > > > > > hi lists, > > > > > > > > > > My ACS routine is like this: > > > > > ... > > > > > *WHEN(&HLQ = &IMSDB) SET &STORGRP = > > 'SGIMSDB','SGSPILL'* > > > > > *...* > > > > > ** > > > > > Whatever(yes or no) I specify for *Overflow *of SGSPILL and > > (SGSPILL > > > > or > > > > > nothing) for *Extend SG Name *of SGIMSDB in ISMF, > > > > > it always works fine. > > > > > So what's meaning of *Overflow* * *and *Extend SG Name?* > > > > > > > > > > > > > > > thanks!! > > > > > > > > > > > > > > > Smartcurl Zhang > > > > > > > > The overflow SG is used for the allocation of a dataset. Usually > > SGSPILL > > > > is set to DIS NEW and will only be used for allocating a datasets > > when > > > > SGIMSDB has insufficient space. > > > > > > > > The Extend SG is used when an existing dataset has to expand to a > > new > > > > volume, but there is not enough space in the current SG. In this > > case > > > > the dataset can extend to a volume in the Extend SG. > > > > > > > > Kees. > > > > > > ********************************************************************** > > > > For information, services and offers, please visit our web site: > > > > http://www.klm.com. This e-mail and any attachment may contain > > > > confidential and privileged material intended for the addressee > > > > only. If you are not the addressee, you are notified that no part > > > > of the e-mail or any attachment may be disclosed, copied or > > > > distributed, and that any other action related to this e-mail or > > > > attachment is strictly prohibited, and may be unlawful. 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